Dry-method bag-type gas purification device for coal gas of coal gasifier

Abstract

The invention relates to a dry-method bag-type gas purification device for coal gas of a coal gasifier. The adopted technical scheme is as follows: the coal gasifier is connected with a waste heat recoverer, the waste heat recoverer is connected with a raw gas pipeline, the raw gas pipeline is communicated with a low-pressure pulse bag-type dust collector, the other end of the raw gas pipeline iscommunicated with a clean gas pipeline through a by-pass valve assembly, the low-pressure pulse bag-type dust collector is communicated with the clean gas pipeline, the clean gas pipeline is providedwith a gas water sealer, the clean gas pipeline is connected with a spraying and washing tower, the spraying and washing tower is connected with a furnace starting and stopping diffusing tower through a furnace starting and stopping fan, a pipeline between the spraying and washing tower and the furnace starting and stopping fan is connected with a system pipe network, the low-pressure pulse bag-type dust collector is connected with a pneumatic ash conveying device, the pneumatic ash conveying device is connected with a master ash bin, and a nitrogen preheating device is respectively connectedwith the low-pressure pulse bag-type dust collector and the pneumatic ash conveying device. The device protects the environment, has good gas purification effect, saves energy, has low cost and is safe.

Description

technical field [0001] The invention belongs to the field of gas purification devices, and in particular relates to a gas purification device for purifying gas produced by a coal gasification furnace by a bag-type dry method. Background technique [0002] The gas produced by the coal gasifier is water gas, but it contains a lot of dust and cannot be used directly. It must be dust-removed and purified before use. At present, most coal gasifiers use water washing to remove dust. Water washing produces waste water and waste residue, causing secondary pollution of water. The sewage needs to be treated. The water consumption is serious, and it pollutes the environment. The collected dust loses its reuse value. The dust concentration of the purified gas is 50mg / Nm 3 Above, and the investment is high, occupying a large area. Contents of the invention [0003] In order to solve the above problems, the present invention provides a low cost, environmental protection, energy saving...

AI Technical Summary

Problems solved by technology

[0002] The gas produced by the coal gasifier is water gas, but it contains a lot of dust and cannot be used directly. It must be dust-removed and purified before use.

At present, most coal gasifiers use water washing to remove dust. Water washing produces waste water and waste residue, causing secondary pollution of water. The sewage needs to be treated. The water consumption is serious, and it pollutes the environment. The collected dust loses its reuse value. The dust concentration of the purified gas is 50mg / Nm 3 Above, and high investment, large area

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